CPU fan sudden/momentary increase then decrease. Tags: CPUs Processors Intel Last response: December 6, 2010 1:43 AM in CPUs Share anonymous1986 December 5, 2010 6:39:43 PM Hi, very occasionally (only ever heard it twice) I hear my stock Intel CPU fan rev up (saw 1800rpm on intel desktop utilities) and then a second or less later go back to its normal speed (1300 rpm). Just wondering if this is normal behaviour? The processor is an i5 760, the computer was idle (40C processor) when it happened. Thanks for any suggestions! More about : cpu fan sudden momentary increase decrease | E-mail me updates | Report abuse Register or log in to remove beanoslim CPUs Authority December 5, 2010 9:16:16 PM Intel has Speedstep technology that automatically increases and decreases the fan speed in accordance with the cpu heat. It can be enabled and disabled in the bios but it sounds like its working ok, you can also change settings in the bios to have it react to your prefered temp settings if you want. | Report abuse wa1 CPUs Expert December 6, 2010 1:29:45 AM That's a normal, just like beanoslim said above. If your stock cooler make loud noise then you can buy an aftermarket cooler for just about $50-$60. | Report abuse Dylan80 December 6, 2010 1:43:19 AM Yep.... BIOS setting that auto-controls the fan speed when your processor gets too hot I guess. Press the F8/F11 key (whichever your motherboard says when you start up) and fiddle (VERYYYY CAREFULLY) with the BIOS, looking for a fan speed, or auto-temperature setting | Report abuse Register or log in to remove Ask the community Publish Tom's Hardware>Forum>CPUs>CPU fan sudden/momentary increase then decrease.> Related ressources: ForumWould increase in RAM decrease render times? ForumDoes increase in CPU Heat decrease CPU speed? ForumDoes a 'Push-Pull' Setup Decrease CPU Temps? ForumHow to increase/decrease Vcore on this BIOS?! :S ForumHow to increase CPU fan Speed Forum ForumIncrease cpu fan speed ForumA way to increase cpu fan when cpu temp. increase ? ForumIncrease clock vs decrease timing... ForumIdle temp increase /load temp decrease ? ForumDecrease in performance from higher overclocks? ForumWould CPU load increase with decreasing clock speed. ForumVCore significant increase and decrease Forum**Help**Dramatic Decrease in FPS for WoW--- ForumHow high should i increase CPU voltage?? ForumDowngrading HSF to increase case fans? ForumIdentifying the source of massive CPU temp increase . ForumConcerning the "hygiene" of my C70 case, and how to maintain it. ForumBest CPU Cooler for Intel i7-970 CPU ForumCPU upgrade for HP P6210Y - M2N78-LA (Violet) motherboard More resources Read discussions in other CPUs categories AMD Intel Intel i5 Intel i7 Phenom Cooling Performance !